html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

* {
    padding: 0;
    margin: 0;
}

body {
    background-image: url(../images/ll.jpg);
    background-size: cover;
    background-position: center;
    font-family: 14px 'microsoft yahei';
    color: #333333;
    font-weight: 500;
}